id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
18901,Using serial host device make guest boot hang,cderenne,,"I'm using the serial host device since a long time.
Using Fedora (from 20 now 30) host and XP host (because of sortware only running on Windows XP using serial device)
Until VB 5.12, everything worked thing.
But now, after update to Fedora 30, I had to update to the last VirtuaBox release (6.0.10).
My guest does not boot anymore (it hangs)
If i uncheck serial port, it boots.
If I keep serial port and disable it, My guest Boots, serial COM is visible but unsuable (which is normal).

VBox.log is showing this : (see file attached)
 Failed to change parameters to 9600,EVEN,7,1 -> VERR_DEV_IO_ERROR
 Failed to change parameters to 1200,EVEN,7,1 -> VERR_DEV_IO_ERROR

",defect,new,uart,VirtualBox 6.0.10,,,,Windows,Linux